To find all the divisors of the number 118,770:
- 1. Decompose the number into prime factors.
- See how you can find out how many factors (divisors) the number has, without actually calculating them.
- 2. Multiply the prime factors in all their unique combinations, that yield different results.
1. Carry out the prime factorization of the number 118,770:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
118,770 = 2 × 3 × 5 × 37 × 107
118,770 is not a prime number but a composite one.
- Prime number: a natural number that is divisible (divided evenly) only by 1 and itself. A prime number has exactly two factors: 1 and the number itself.
- Examples of prime numbers: 2 (factors 1, 2), 3 (factors 1, 3), 5 (factors 1, 5), 7 (factors 1, 7), 11 (factors 1, 11), 13 (factors 1, 13), ...
- Composite number: a natural number that has at least one factor other than 1 and itself. So it is neither a prime number nor 1.
- Examples of composite numbers: 4 (it has 3 factors: 1, 2, 4), 6 (it has 4 factors: 1, 2, 3, 6), 8 (it has 4 factors: 1, 2, 4, 8), 9 (it has 3 factors: 1, 3, 9), 10 (it has 4 factors: 1, 2, 5, 10), 12 (it has 6 factors: 1, 2, 3, 4, 6, 12), ...
How to count the number of factors of a number?
Without actually finding the factors
- If a number N is prime factorized as:
N = am × bk × cz
where a, b, c are the prime factors and m, k, z are their exponents, natural numbers, .... - ...
- Then the number of factors of the number N can be calculated as:
n = (m + 1) × (k + 1) × (z + 1) - ...
- In our case, the number of factors is calculated as:
- n = (1 + 1) × (1 + 1) × (1 + 1) × (1 + 1) × (1 + 1) = 2 × 2 × 2 × 2 × 2 = 32
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 118,770
- Multiply the prime factors involved in the prime factorization of the number in all their unique combinations, that give different results.
- Also add 1 to the list of factors (divisors). All the numbers are divisible by 1.
All the factors (divisors) are listed below - in ascending order
The list of factors (divisors):
Numbers other than 1 that are not prime factors are composite factors (divisors).
neither prime nor composite =
1
prime factor =
2
prime factor =
3
prime factor =
5
composite factor = 2 × 3 =
6
composite factor = 2 × 5 =
10
composite factor = 3 × 5 =
15
composite factor = 2 × 3 × 5 =
30
prime factor =
37
composite factor = 2 × 37 =
74
prime factor =
107
composite factor = 3 × 37 =
111
composite factor = 5 × 37 =
185
composite factor = 2 × 107 =
214
composite factor = 2 × 3 × 37 =
222
composite factor = 3 × 107 =
321
This list continues below...
... This list continues from above
composite factor = 2 × 5 × 37 =
370
composite factor = 5 × 107 =
535
composite factor = 3 × 5 × 37 =
555
composite factor = 2 × 3 × 107 =
642
composite factor = 2 × 5 × 107 =
1,070
composite factor = 2 × 3 × 5 × 37 =
1,110
composite factor = 3 × 5 × 107 =
1,605
composite factor = 2 × 3 × 5 × 107 =
3,210
composite factor = 37 × 107 =
3,959
composite factor = 2 × 37 × 107 =
7,918
composite factor = 3 × 37 × 107 =
11,877
composite factor = 5 × 37 × 107 =
19,795
composite factor = 2 × 3 × 37 × 107 =
23,754
composite factor = 2 × 5 × 37 × 107 =
39,590
composite factor = 3 × 5 × 37 × 107 =
59,385
composite factor = 2 × 3 × 5 × 37 × 107 =
118,770
32 factors (divisors)
What times what is 118,770?
What number multiplied by what number equals 118,770?
All the combinations of any two natural numbers whose product equals 118,770.
1 × 118,770 = 118,770
2 × 59,385 = 118,770
3 × 39,590 = 118,770
5 × 23,754 = 118,770
6 × 19,795 = 118,770
10 × 11,877 = 118,770
15 × 7,918 = 118,770
30 × 3,959 = 118,770
37 × 3,210 = 118,770
74 × 1,605 = 118,770
107 × 1,110 = 118,770
111 × 1,070 = 118,770
185 × 642 = 118,770
214 × 555 = 118,770
222 × 535 = 118,770
321 × 370 = 118,770
16 unique multiplications The final answer:
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